Piston-rod and method of protecting same



'mq-Modem PROTECTING SAME.

CARI l PISTON ROD AND METHOD OF A No; 532.529. Patented Jan. 15,1895.

WALTER E. CARR, O-F CHICAGO, ILLINOIS.

PISTON-RQD'AND-METHOD OF PROTECTING SAME.l

SPECIFICATION forming part of Letters Patent No. 532,529, dated January 15, 1895.

Application iiled September 1, 1894'. Serial No. 521,906. (No model.) v

.To a/ZZ whom it may concern.-

Be it known that I, WALTER E. CARR, a

cago, in the county of Cook and State of Illifnois, have invented a new and useful Piston- Rod and Method of Protecting the Same, of which the following is a specification.

This invention relates to piston rods for steam,hydraulic or other fluid cylinders, and the method of making the same.

The object of the invention is to protect the piston rod from the injurious action of the steam or fluid with which-it comes-'in contact.

The invention consists substantially inthe method and construction hereinafter more fully set forth, as indicated in the accompanying drawings and finally' pointed out in the appended claims.' p

Referring to the accompanying drawings,

Figure lis a view in central longitudinal sec-v tion of a cylinder with a piston and a pair of piston rods embodying my invention shown in elevation. Fig. 2 is an enlarged detail view illustrating in central longitudinal section a piston rod constructed in accordance with my invention.

In the drawings reference sign A d esignates` a steam, hydraulic or other iuid motor cylinder.

C designates a piston of usual construction; B, piston rods, and D the stuffing boxes therefor. The end of the piston rod is screw threaded in theV usual manner as at E to secure the same to the piston C, as indicated in Fig. 2.

It has been found in practice that piston rods are injuriously affected by coming into contact with the steam, water or other fluid employed in the operation of the piston, on account of corrosion, eating away or pitting of the rod by the chemical or acid constituents thereof. This pitting or eating away of the piston rod has frequently progressed from prolonged use to the point of liability to breakage before the defect is discovered. Moreover, any loss of strength or rigidity in the rod is to be guarded against in order to avoid serious accidents in the many relations in which cylinders and pistons having piston rods are used.

It has been essayed to correct the `evil mentionedby inclosing the piston rod, a por-l tion of its length, in a hollow sleeve or tube of copper or other suitable material not subject tothe injurious action of the steam,

water or other fluid. To this end it has been .order to slip the tube or sleeve onto the rod, and

hence the rod has been thereby weakened at the end where it is secured to the piston, and

`hence at the point where it is desirable thatit be strongest. Again, the inoasing of the piston rod in a sleeve or tube does not operate to supplystrength and rigidity to the rod in place of the material removed therefrom to accommodate the sleeve or tube, and hence the rod is materially and undesirably weakened.v

throughout the entire portion thereof which has been reduced in size. Again, the accurate turning of the rod in order to reduce the same to the necessarysize to receive the tube or sleeve has necessitated the most skillful handling and adjustments in order to secure absolute accuracy. Moreover, the use of a tube or shell resulted in forming a seam or joint at the extremity thereof, which permitted theV injurious action of the steam, water or other fluid to take place at that point. In carrying out my invention I avoid all these objections in the following manner:

Instead of reducing the rod to the extremity/thereof, I reduce it only a portion of its length and end the reduced part at the point By any suitable or con-- molecules of the metal are supplied to the rod in a condition to supply the loss of the material removed during the turning of the rod. Objectionable seams are avoided and only ordinary skill and handling is required in positioning the rod in the lathe to be turned down. I indicate in Fig. l the outer point of the rod to which the deposited sheathing is carried by reference sign G, and the sheathing applied in accordance with my invention I designate by reference sign H.

Vhile I have shown my invention as applied to a pistou having two piston rods itis evident and will be readily understood that it is broadly adapted for use in connection with one or several rods to the same piston. It will also be evident that myinvention may be applied to any piston used Vforanypurpose.

Having now fully ascertained the nature of my invention and the manner of its practical application, what I claim as new, and

desire to secure by Letters Patent of the` United States, is-

1. The method of protecting pistonrods, which consists in removing a portion of the material out of which the rod is made, and then electro-depositing a suitable protecting material thereon to takethe place of theremoved portion; asand for vthe purposeset forth.

2. The method of protecting piston rods from the action of steam, water or other fluid, which consists in removing a portion of the body of the rod intermediate its ends, and 35 tion by Aelectro-depositing suitable material thereon, whereby the strength of the rod is not reduced by such removal; as and for the purpose set forth.

4. The combination with a piston rod, having arportion of `its material removed to `a point adjacent to its point of attachment to thepiston, anda coating of protective material electro-deposited on said rod inplace of the removed portion, whereby said rod is protected from the action of the steam, water or other Huid, `and is not weakened by said removal; as and forthe purpose set forth.

In witness whereof I have hereunto set my handrthis 29th dayof August, 1894:, in the presence of the subscribing witnesses.

WALTER E. CARR.

Witnesses:

S. E. DARBY, M. I. CAVANAGH. 

